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When the engine is running but the high pressure lance valve is closed the pressure rises and lifts the unloader valve from it's seat and the water is then circulated through the unloader valve which presents considerably less resistance to the flow than the lance nozzle therefore the engine is doing less work.
When the lance valve is opened the line pressure will drop even further and the unloader valve will close causing a sudden pressure rise, therefore the engine will be working much harder.
What are the symptoms? Water in oil requires changing seals ( probably high and low pressure) Low , fluctuating pressure is probably valves need cleaning or replacement. Low pressure could also be worn unloader. Water leaking from pump is worn high pressure seals. Many possible failures.
Saying pump has failed is like saying my car does not work.
This is typically due to the unloader bypass valve not operating properly. You can remove and clean this valve or you may want to replace the valve with a new one. If you take the high pressure hose off of the pump and with the water turned on you can start the engine each time then you probably should replace the unloader bypass valve.
John: I had a similar problem with a brand new CH-made compressor. The problem was not with the unloader valve, but with the check valve located where the air from the pump enters the tank. The check valve was not seating correctly due to brass filings from manufacture. The defective check valve was allowing air to escape back the wrong way from the tank to the pressure switch and through the unloader valve. This backflow from the tank would start to happen when the pump stopped after reaching high pressure. The back flow would continue until the pump restarted at the low pressure point. This cycling would continue as you described. Once I cleaned the check valve, everything (including the unloader valve) started working correctly. I hope this helps. And remember, don't work on these when they are under pressure and always wear safety glasses.
sounds like you have a unloader valve problem or a crack in the pressure manifold housing between pressure outlet and unloader valve assy allowing unloader to cycle on/ off
or some dirt trapped in the unloader valve seat , make sure you have good supply of water - ie good flow from tap to pump
try cleaning unloader 1st and fitting in line tap filter
The pressure adjuster you are talking about is actually your unloader which is a pressure relief valve. It is normal for this to pop up and down as it moves in and out of bypass mode. Your pressure issue could be a failed unloader, valves or packings in the pump. You will need to bypass your unloader valve to find if the issue lies in the pump or if it is simply a failed unloader. If you have any questions, need parts or service, please feel free to contact me using the information below.
The Karcher K2400HH and G2400HH do not have an unloader valve, they have a spill valve which is located under the black cap on top of the pump.
The spill valve needs to be removed and the side walls of the hole it sits in need to be wire brushed to remove deposits. then you can put it back in and put the pump back together.
could be allsorts. seals worn. ceramic pistons split, inlet manifold split( frost damage), unloader valve sticking, etc etc.
Put mains water pressure onto it and look for leaks, then run machine and see if it increases pressure, if not i would suspect unloader valve sticking.....
Not very familiar with the 1050 but i'm a service engineer for high press cleaning equipment...
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